Abstract: A fuel injection characteristic sensing device obtains an injection characteristic of a target injector (an injector of each cylinder of a multi-cylinder engine) at each time. The device has a program for sequentially sensing fuel pressure at a sensing point corresponding to a fuel pressure sensor, which is provided at a fuel inlet of each injector, based on an output of the fuel pressure sensor. The device has a program for detecting predetermined timings (injection timings such as an injection start timing and an injection end timing) in a series of operations concerning fuel injection of the injector of each cylinder based on the sequentially sensed fuel pressure. Thus, the injection characteristic at each time including a temporal characteristic change can be obtained.

Abstract: A fuel system diagnostic module comprises a pressure module and a fault diagnostic module. The pressure module determines first and second pressures of a fuel rail of a fuel system at first and second times, respectively. The second time is after shutdown of an engine. The fault diagnostic module selectively diagnoses a fault in the fuel system based upon a comparison of a predetermined period with a period between the engine shutdown and the second time.

Abstract: A method for operating a fuel-injection system, in particular of an internal combustion engine, in which fuel stored inside a pressure reservoir is injected by at least one fuel injector. At least one performance quantity of the fuel injector that is a function of the fuel pressure prevailing inside the pressure reservoir is evaluated in order to infer the fuel pressure.

Abstract: A method for checking the output signal of a rail pressure sensor of a direct-injecting internal combustion engine having a common rail system for plausibility, including the following steps: the output signal of the rail pressure sensor is detected over a predefinable period of time and recorded; the output signal is transformed into the frequency space; characteristic features are extracted from the transformed signal; a rail pressure value is calculated on the basis of the features and additional, predefined influencing variables; an average rail pressure value is simultaneously ascertained from the output signal of the rail pressure sensor; the average rail pressure value is compared with the calculated rail pressure value; in the event that the calculated rail pressure value deviates from the average rail pressure value by a predefined limiting value, an error signal is output and/or stored in an error memory.

Abstract: A procedure for diagnosing a tank system of a vehicle with at least two controllable tank ventilation valves, with at least two points of release for a tank ventilation mixture, whereby at least a first point of release runs into an inlet manifold of a combustion engine downstream of a throttle device and at least a second point of release is arranged in an inlet manifold of the combustion engine upstream of the throttle device, especially upstream of a compressor, is thereby characterized, in that for diagnosing the functionality of the tank ventilation system the at least two tank ventilation valves are controlled independently of each other and its functionality can be implied due to the pressure that occurs in the tank system.

Abstract: A fuel injection device (fuel supply system) of a common rail type fuel injection system for an engine includes a pressure sensor disposed in a fuel inlet of an injector for measuring a fuel pressure at a position where the sensor is disposed and an ECU for sensing various kinds of pressure fluctuations associated with the injection including a pressure leak due to an injection operation of the injector and waving characteristics due to actual injection thereof based on sensor outputs from the pressure sensor. The ECU serially obtains the sensor outputs from the pressure sensor at intervals of 20 ?sec.

Abstract: A pressure sensor comprises a reference voltage generating part which generates a predetermined voltage as a reference and a sensing part which senses the pressure of the detection object and outputs a signal according to the pressure therein. The outputs of the reference voltage generating part and the sensing part are inputted to a tri-state buffer. Switch terminals of the tri-state buffers are connected with the command line. When the command signal is applied to the command line, either one of the output of the reference voltage generating part or the sensing part is outputted to the output line.

Abstract: A dynamometer element including a bolt on which a diaphragm is mounted, the diaphragm being surrounded by a sleeve, to which a force component to be measured is applied perpendicularly to the longitudinal direction of the bolt, the sleeve being spaced from the bolt in such a way that the diaphragm is strained as a function of the force component, a sensor system for measuring the strain being provided on the diaphragm.